int Led1=1;
int Led2=2;
int Led3=3;
int Led4=4;
int Led5=5;
int Led6=6;

void style_1(void)
{
  unsigned char j;
  for(j=1;j<=6;j++)
    digitalWrite(j,HIGH);
    delay(100); 
  
  for(j=6;j>=1;j--)
  {
    digitalWrite(j,LOW);
    delay(100); 
   }
 }
void setup() {
  // put your setup code here, to run once:
  unsigned char i;
  for(i=1;i<=6;i++)
    pinMode(i,OUTPUT); 
}

void loop() {
  // put your main code here, to run repeatedly:
  style_1();
}
